Calling Qt class methods from QML - Revision history

Hamishwillee: Hamishwillee - Add Abstract. Tidy wiki text

2012-10-17T22:24:07Z

Hamishwillee - Add Abstract. Tidy wiki text

Hamishwillee: Text replace - "`" to ""`


2012-10-11T01:16:07Z
Text replace - "<code cpp>" to "<code cpp-qt>"

			
			
			
			
		
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		Revision as of 01:16, 11 October 2012
		
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  ==Qt Project File==   ==Qt Project File==
    
− <code cpp> + <code cpp-qt>
  #To make sure we use declarative   #To make sure we use declarative
  QT += declarative   QT += declarative
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  '''stringhelper.h'''   '''stringhelper.h'''
    
− <code cpp> + <code cpp-qt>
  #ifndef STRINGHELPER_H   #ifndef STRINGHELPER_H
  #define STRINGHELPER_H   #define STRINGHELPER_H
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  '''ui.qml'''   '''ui.qml'''
    
− <code cpp> + <code cpp-qt>
  import Qt 4.7   import Qt 4.7
    
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  '''main.cpp'''   '''main.cpp'''
    
− <code cpp> + <code cpp-qt>
  #include <QApplication>   #include <QApplication>
  #include <QDeclarativeView>   #include <QDeclarativeView>



Villep: Villep - Added .pro file things required.
2012-06-28T12:20:08Z
Villep - Added .pro file things required.

			
			
			
			
		
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		Revision as of 12:20, 28 June 2012
		
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  + [[Category:Qt]][[Category:Qt Quick]][[Category:Code Snippet]][[Category:Code Snippet]][[Category:MeeGo Harmattan]][[Category:Symbian]]
  {{ArticleMetaData <!-- v1.2 -->   {{ArticleMetaData <!-- v1.2 -->
  |sourcecode= <!-- Link to example source code (e.g. [[Media:The Code Example ZIP.zip]]) -->   |sourcecode= <!-- Link to example source code (e.g. [[Media:The Code Example ZIP.zip]]) -->
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  * Qt 4.7 or higher is installed on your platform.   * Qt 4.7 or higher is installed on your platform.
  + 
  + ==Qt Project File==
  + 
  + <code cpp>
  + #To make sure we use declarative
  + QT += declarative
  + 
  + #To get files deployed on device / emulator
  + files.sources += ui.qml
  + DEPLOYMENT += files
  + </code>
    
  ==Source==   ==Source==
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  The code snippet has demonstrated how to call Qt class methods from QML. This required setting the {{Icode|QObject}}-derived object as a context property to the root object of {{Icode|QDeclarativeView}}. The methods of the Qt-derived class had to be either public slots or regular methods declared with the {{Icode|Q_INVOKABLE}} macro.   The code snippet has demonstrated how to call Qt class methods from QML. This required setting the {{Icode|QObject}}-derived object as a context property to the root object of {{Icode|QDeclarativeView}}. The methods of the Qt-derived class had to be either public slots or regular methods declared with the {{Icode|Q_INVOKABLE}} macro.
−  
− [[Category:Qt]][[Category: Qt Quick]][[Category:Code Snippet]][[Category:Code Snippet]][[Category:MeeGo Harmattan]] [[Category:Symbian]]  




Hamishwillee: Text replace - "Category:MeeGo" to "Category:MeeGo Harmattan"
2012-06-13T10:51:33Z
Text replace - "Category:MeeGo" to "Category:MeeGo Harmattan"

			
			
			
			
		
		← Older revision
		Revision as of 10:51, 13 June 2012
		
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  The code snippet has demonstrated how to call Qt class methods from QML. This required setting the {{Icode|QObject}}-derived object as a context property to the root object of {{Icode|QDeclarativeView}}. The methods of the Qt-derived class had to be either public slots or regular methods declared with the {{Icode|Q_INVOKABLE}} macro.   The code snippet has demonstrated how to call Qt class methods from QML. This required setting the {{Icode|QObject}}-derived object as a context property to the root object of {{Icode|QDeclarativeView}}. The methods of the Qt-derived class had to be either public slots or regular methods declared with the {{Icode|Q_INVOKABLE}} macro.
    
− [[Category:Qt]][[Category: Qt Quick]][[Category:Code Snippet]][[Category:Code Snippet]][[Category:MeeGo]] [[Category:Symbian]] + [[Category:Qt]][[Category: Qt Quick]][[Category:Code Snippet]][[Category:Code Snippet]][[Category:MeeGo Harmattan]] [[Category:Symbian]]



Hamishwillee: moved CS001613 - Calling Qt class methods from QML to Calling Qt class methods from QML: Merge into wiki.
2012-05-11T06:42:28Z
moved CS001613 - Calling Qt class methods from QML to Calling Qt class methods from QML: Merge into wiki.

		
		← Older revision
		Revision as of 06:42, 11 May 2012
		


Hamishwillee: Removed protection from "CS001613 - Calling Qt class methods from QML": Merging into Wiki
2012-05-11T06:37:22Z
Removed protection from "CS001613 - Calling Qt class methods from QML": Merging into Wiki

		
		← Older revision
		Revision as of 06:37, 11 May 2012
		


Hamishwillee: Hamishwillee - Bot update
2012-05-11T06:37:19Z
Hamishwillee - Bot update

			
			
			
			
		
		← Older revision
		Revision as of 06:37, 11 May 2012
		
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− {{KBCS}} + {{ArticleMetaData <!-- v1.2 -->
− {{ArticleMetaData + 
− |id=CS001613 + 
− |platform=S60 5th Edition<br>Maemo + 
− |devices=Nokia 900 + 
− |category=Qt + 
− |subcategory=Qt Quick + 
− |creationdate=July 6, 2010 + 
− |keywords=QML, QDeclarativeContext, Q_INVOKABLE + 
−   + 
  |sourcecode= <!-- Link to example source code (e.g. [[Media:The Code Example ZIP.zip]]) -->   |sourcecode= <!-- Link to example source code (e.g. [[Media:The Code Example ZIP.zip]]) -->
  |installfile= <!-- Link to installation file (e.g. [[Media:The Installation File.sis]]) -->   |installfile= <!-- Link to installation file (e.g. [[Media:The Installation File.sis]]) -->
− |sdk=<!-- SDK(s) built and tested against (e.g. [http://linktosdkdownload/ Nokia Qt SDK 1.1]) --> + |devices= Nokia 900
− |devicecompatability=<!-- Compatible devices (e.g.: All* (must have GPS) ) --> + |sdk= <!-- SDK(s) built and tested against (e.g. [http://linktosdkdownload/ Nokia Qt SDK 1.1]) -->
− |signing=<!-- Empty or one of Self-Signed, DevCert, Manufacturer --> + |platform= S60 5th Edition<br>Maemo
− |capabilities=<!-- Capabilities required (e.g. Location, NetworkServices.) --> + |devicecompatability= <!-- Compatible devices (e.g.: All* (must have GPS) ) -->
− |author=[[User:Kratsan]] + |dependencies= <!-- Any other/external dependencies e.g.: Google Maps Api v1.0 -->
  + |signing= <!-- Empty or one of Self-Signed, DevCert, Manufacturer -->
  + |capabilities= <!-- Capabilities required by the article/code example (e.g. Location, NetworkServices. -->
  + |keywords= QML, QDeclarativeContext, Q_INVOKABLE
  + |language= <!-- Language category code for non-English topics - e.g. Lang-Chinese -->
  + |translated-by= <!-- [[User:XXXX]] -->
  + |translated-from-title= <!-- Title only -->
  + |translated-from-id= <!-- Id of translated revision -->
  + |review-by= <!-- After re-review: [[User:username]] -->
  + |review-timestamp= <!-- After re-review: YYYYMMDD -->
  + |update-by= <!-- After significant update: [[User:username]]-->
  + |update-timestamp= <!-- After significant update: YYYYMMDD -->
  + |creationdate= 20100624
  + |author= [[User:Kratsan]]
  + <!-- The following are not in current metadata -->
  + |subcategory= Qt Quick
  + |id= CS001613
  }}   }}
    
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  This code snippet shows how to call Qt class methods directly from QML.   This code snippet shows how to call Qt class methods directly from QML.
    
− In order to enable the calling of Qt class methods from QML code, the methods must be declared as public slots or conventional methods with the <tt>Q_INVOKABLE</tt> macro. In both cases, Qt methods are available to the Qt Meta-Object system and the methods are callable from QML. One drawback in the public slot method is that the slot cannot return a value. Conversely, the method with the <tt>Q_INVOKABLE</tt> macro is able to do this. + In order to enable the calling of Qt class methods from QML code, the methods must be declared as public slots or conventional methods with the {{Icode|Q_INVOKABLE}} macro. In both cases, Qt methods are available to the Qt Meta-Object system and the methods are callable from QML. One drawback in the public slot method is that the slot cannot return a value. Conversely, the method with the {{Icode|Q_INVOKABLE}} macro is able to do this.
    
− In the following demonstration we define a new Qt class, <tt>StringHelper</tt>, which has one invokable <tt>echo</tt> method and one public slot, <tt>toggleEcho</tt>. The <tt>echo</tt> method will return the given string as is, or as reversed if the public slot <tt>toggleEcho(true)</tt> has been called. + In the following demonstration we define a new Qt class, {{Icode|StringHelper}}, which has one invokable {{Icode|echo}} method and one public slot, {{Icode|toggleEcho}}. The {{Icode|echo}} method will return the given string as is, or as reversed if the public slot {{Icode|toggleEcho(true)}} has been called.
    
− The <tt>StringHelper</tt> class is instantiated in '''main.cpp'''. The <tt>QObject</tt>-derived object <tt>stringHelper</tt> is then set as a context property to the root element of <tt>QDeclarativeView</tt>. The result is that the root element <tt>rect</tt> in the <tt>ui.qml</tt> document will see <tt>StringHelper</tt> as its child element. + The {{Icode|StringHelper}} class is instantiated in '''main.cpp'''. The {{Icode|QObject}}-derived object {{Icode|stringHelper}} is then set as a context property to the root element of {{Icode|QDeclarativeView}}. The result is that the root element {{Icode|rect}} in the {{Icode|ui.qml}} document will see {{Icode|StringHelper}} as its child element.
    
  ==Preconditions==   ==Preconditions==
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  ===Postconditions===   ===Postconditions===
    
− The code snippet has demonstrated how to call Qt class methods from QML. This required setting the <tt>QObject</tt>-derived object as a context property to the root object of <tt>QDeclarativeView</tt>. The methods of the Qt-derived class had to be either public slots or regular methods declared with the <tt>Q_INVOKABLE</tt> macro. + The code snippet has demonstrated how to call Qt class methods from QML. This required setting the {{Icode|QObject}}-derived object as a context property to the root object of {{Icode|QDeclarativeView}}. The methods of the Qt-derived class had to be either public slots or regular methods declared with the {{Icode|Q_INVOKABLE}} macro.
    
− [[Category:Qt]][[Category: Qt Quick]][[Category:Code Examples]][[Category:Code Snippet]][[Category:MeeGo]] [[Category:Symbian]] + [[Category:Qt]][[Category: Qt Quick]][[Category:Code Snippet]][[Category:Code Snippet]][[Category:MeeGo]] [[Category:Symbian]]



Hamishwillee: Hamishwillee - Addition to article of: Category:MeeGo Category:Symbian. (Add platform categories)
2012-02-15T05:42:41Z
Hamishwillee - Addition to article of: Category:MeeGo Category:Symbian. (Add platform categories)

			
			
			
			
		
		← Older revision
		Revision as of 05:42, 15 February 2012
		
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  The code snippet has demonstrated how to call Qt class methods from QML. This required setting the <tt>QObject</tt>-derived object as a context property to the root object of <tt>QDeclarativeView</tt>. The methods of the Qt-derived class had to be either public slots or regular methods declared with the <tt>Q_INVOKABLE</tt> macro.   The code snippet has demonstrated how to call Qt class methods from QML. This required setting the <tt>QObject</tt>-derived object as a context property to the root object of <tt>QDeclarativeView</tt>. The methods of the Qt-derived class had to be either public slots or regular methods declared with the <tt>Q_INVOKABLE</tt> macro.
    
− [[Category:Qt]][[Category: Qt Quick]][[Category:Code Examples]][[Category:Code Snippet]] + [[Category:Qt]][[Category: Qt Quick]][[Category:Code Examples]][[Category:Code Snippet]][[Category:MeeGo]] [[Category:Symbian]]



Hamishwillee: Hamishwillee - Bot change of template (Template:CodeSnippet) - now using Template:ArticleMetaData
2011-06-24T09:23:13Z
Hamishwillee - Bot change of template (Template:CodeSnippet) - now using Template:ArticleMetaData

			
			
			
			
		
		← Older revision
		Revision as of 09:23, 24 June 2011
		
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  {{KBCS}}   {{KBCS}}
− {{CodeSnippet + {{ArticleMetaData
  |id=CS001613   |id=CS001613
  |platform=S60 5th Edition<br>Maemo   |platform=S60 5th Edition<br>Maemo
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  |creationdate=July 6, 2010   |creationdate=July 6, 2010
  |keywords=QML, QDeclarativeContext, Q_INVOKABLE   |keywords=QML, QDeclarativeContext, Q_INVOKABLE
  + 
  + |sourcecode= <!-- Link to example source code (e.g. [[Media:The Code Example ZIP.zip]]) -->
  + |installfile= <!-- Link to installation file (e.g. [[Media:The Installation File.sis]]) -->
  + |sdk=<!-- SDK(s) built and tested against (e.g. [http://linktosdkdownload/ Nokia Qt SDK 1.1]) -->
  + |devicecompatability=<!-- Compatible devices (e.g.: All* (must have GPS) ) -->
  + |signing=<!-- Empty or one of Self-Signed, DevCert, Manufacturer -->
  + |capabilities=<!-- Capabilities required (e.g. Location, NetworkServices.) -->
  + |author=[[User:Kratsan]]
  }}   }}
    



Copyeditor: Protected "CS001613 - Calling Qt class methods from QML" ([edit=sysop] (indefinite) [move=sysop] (indefinite))
2010-07-06T09:54:37Z
Protected "CS001613 - Calling Qt class methods from QML" ([edit=sysop] (indefinite) [move=sysop] (indefinite))

		
		← Older revision
		Revision as of 09:54, 6 July 2010

← Older revision		Revision as of 10:51, 13 June 2012
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	The code snippet has demonstrated how to call Qt class methods from QML. This required setting the {{Icode\|QObject}}-derived object as a context property to the root object of {{Icode\|QDeclarativeView}}. The methods of the Qt-derived class had to be either public slots or regular methods declared with the {{Icode\|Q_INVOKABLE}} macro.		The code snippet has demonstrated how to call Qt class methods from QML. This required setting the {{Icode\|QObject}}-derived object as a context property to the root object of {{Icode\|QDeclarativeView}}. The methods of the Qt-derived class had to be either public slots or regular methods declared with the {{Icode\|Q_INVOKABLE}} macro.

−	[[Category:Qt]][[Category: Qt Quick]][[Category:Code Snippet]][[Category:Code Snippet]][[Category:MeeGo]] [[Category:Symbian]]	+	[[Category:Qt]][[Category: Qt Quick]][[Category:Code Snippet]][[Category:Code Snippet]][[Category:MeeGo Harmattan]] [[Category:Symbian]]

← Older revision		Revision as of 05:42, 15 February 2012
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	The code snippet has demonstrated how to call Qt class methods from QML. This required setting the <tt>QObject</tt>-derived object as a context property to the root object of <tt>QDeclarativeView</tt>. The methods of the Qt-derived class had to be either public slots or regular methods declared with the <tt>Q_INVOKABLE</tt> macro.		The code snippet has demonstrated how to call Qt class methods from QML. This required setting the <tt>QObject</tt>-derived object as a context property to the root object of <tt>QDeclarativeView</tt>. The methods of the Qt-derived class had to be either public slots or regular methods declared with the <tt>Q_INVOKABLE</tt> macro.

−	[[Category:Qt]][[Category: Qt Quick]][[Category:Code Examples]][[Category:Code Snippet]]	+	[[Category:Qt]][[Category: Qt Quick]][[Category:Code Examples]][[Category:Code Snippet]][[Category:MeeGo]] [[Category:Symbian]]

Calling Qt class methods from QML - Revision history

Hamishwillee: Hamishwillee - Add Abstract. Tidy wiki text

Hamishwillee: Text replace - "" to ""

Villep: Villep - Added .pro file things required.

Hamishwillee: Text replace - "Category:MeeGo" to "Category:MeeGo Harmattan"

Hamishwillee: moved CS001613 - Calling Qt class methods from QML to Calling Qt class methods from QML: Merge into wiki.

Hamishwillee: Removed protection from "CS001613 - Calling Qt class methods from QML": Merging into Wiki

Hamishwillee: Hamishwillee - Bot update

Hamishwillee: Hamishwillee - Addition to article of: Category:MeeGo Category:Symbian. (Add platform categories)

Hamishwillee: Hamishwillee - Bot change of template (Template:CodeSnippet) - now using Template:ArticleMetaData

Copyeditor: Protected "CS001613 - Calling Qt class methods from QML" ([edit=sysop] (indefinite) [move=sysop] (indefinite))

Hamishwillee: Text replace - "`" to ""`